| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| package org.apache.qpid.proton.reactor.impl; |
| |
| import java.util.PriorityQueue; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.qpid.proton.engine.Collector; |
| import org.apache.qpid.proton.engine.Event.Type; |
| import org.apache.qpid.proton.engine.impl.CollectorImpl; |
| import org.apache.qpid.proton.reactor.Task; |
| |
| public class Timer { |
| |
| private CollectorImpl collector; |
| private PriorityQueue<TaskImpl> tasks = new PriorityQueue<TaskImpl>(); |
| private AtomicInteger counter = new AtomicInteger(); |
| |
| public Timer(Collector collector) { |
| this.collector = (CollectorImpl)collector; |
| } |
| |
| Task schedule(long deadline) { |
| TaskImpl task = new TaskImpl(deadline, counter.incrementAndGet()); |
| tasks.add(task); |
| return task; |
| } |
| |
| long deadline() { |
| flushCancelled(); |
| if (tasks.size() > 0) { |
| Task task = tasks.peek(); |
| return task.deadline(); |
| } else { |
| return 0; |
| } |
| } |
| |
| private void flushCancelled() { |
| while (!tasks.isEmpty()) { |
| TaskImpl task = tasks.peek(); |
| if (task.isCancelled()) |
| tasks.poll(); |
| else |
| break; |
| } |
| } |
| |
| void tick(long now) { |
| while(!tasks.isEmpty()) { |
| TaskImpl task = tasks.peek(); |
| if (now >= task.deadline()) { |
| tasks.poll(); |
| if (!task.isCancelled()) |
| collector.put(Type.TIMER_TASK, task); |
| } else { |
| break; |
| } |
| } |
| } |
| |
| int tasks() { |
| flushCancelled(); |
| return tasks.size(); |
| } |
| } |